From 8f67da335d08bc06d3333f4bd46b96e6cc096d94 Mon Sep 17 00:00:00 2001 From: Hai Li Date: Wed, 18 Jun 2014 16:55:27 -0400 Subject: [PATCH] drm/msm: Implement msm drm fb_mmap callback function This change implements msm drm specific fb_mmap function for fb device to properly map the fb address to userspace. Signed-off-by: Hai Li Signed-off-by: Stephane Viau Signed-off-by: Rob Clark (+ minor comment tweak) --- drivers/gpu/drm/msm/msm_fbdev.c | 45 ++++++++++++++++++++++++++++++--- 1 file changed, 42 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/msm/msm_fbdev.c b/drivers/gpu/drm/msm/msm_fbdev.c index c437065933e..9c5221ce391 100644 --- a/drivers/gpu/drm/msm/msm_fbdev.c +++ b/drivers/gpu/drm/msm/msm_fbdev.c @@ -19,6 +19,11 @@ #include "drm_crtc.h" #include "drm_fb_helper.h" +#include "msm_gem.h" + +extern int msm_gem_mmap_obj(struct drm_gem_object *obj, + struct vm_area_struct *vma); +static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma); /* * fbdev funcs, to implement legacy fbdev interface on top of drm driver @@ -43,6 +48,7 @@ static struct fb_ops msm_fb_ops = { .fb_fillrect = sys_fillrect, .fb_copyarea = sys_copyarea, .fb_imageblit = sys_imageblit, + .fb_mmap = msm_fbdev_mmap, .fb_check_var = drm_fb_helper_check_var, .fb_set_par = drm_fb_helper_set_par, @@ -51,6 +57,31 @@ static struct fb_ops msm_fb_ops = { .fb_setcmap = drm_fb_helper_setcmap, }; +static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma) +{ + struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par; + struct msm_fbdev *fbdev = to_msm_fbdev(helper); + struct drm_gem_object *drm_obj = fbdev->bo; + struct drm_device *dev = helper->dev; + int ret = 0; + + if (drm_device_is_unplugged(dev)) + return -ENODEV; + + mutex_lock(&dev->struct_mutex); + + ret = drm_gem_mmap_obj(drm_obj, drm_obj->size, vma); + + mutex_unlock(&dev->struct_mutex); + + if (ret) { + pr_err("%s:drm_gem_mmap_obj fail\n", __func__); + return ret; + } + + return msm_gem_mmap_obj(drm_obj, vma); +} + static int msm_fbdev_create(struct drm_fb_helper *helper, struct drm_fb_helper_surface_size *sizes) { @@ -104,8 +135,16 @@ static int msm_fbdev_create(struct drm_fb_helper *helper, mutex_lock(&dev->struct_mutex); - /* TODO implement our own fb_mmap so we don't need this: */ - msm_gem_get_iova_locked(fbdev->bo, 0, &paddr); + /* + * NOTE: if we can be guaranteed to be able to map buffer + * in panic (ie. lock-safe, etc) we could avoid pinning the + * buffer now: + */ + ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr); + if (ret) { + dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret); + goto fail; + } fbi = framebuffer_alloc(0, dev->dev); if (!fbi) { @@ -189,7 +228,7 @@ struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev) struct msm_drm_private *priv = dev->dev_private; struct msm_fbdev *fbdev = NULL; struct drm_fb_helper *helper; - int ret = 0; + int ret; fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); if (!fbdev) -- 2.41.0